Testing                                                                                                                     SUBSTANCE OR REAM WEIGHT

Substance or Ream Weight

General

Select 10 sheets at random and cut from each sheet, a test piece of size 25x25 cm. Weigh the sheets individually and calculate the substance of each test piece. Report both the individual values and the mean.

A balance sensitive to 0. 25 percent of the load applied and so graduated that readings of this degree of accuracy may be made.

A suitably calibrated sheet-weighing balance, designed to indicate the weight of the ream directly when only one sheet of the paper of the given size is weighed on it, may be used.

Carry out the determination on 10 sheets selected at random. Take a test piece of size 25 x 25 cm from each sheet. Measure the sides correct to 0. 5 percent for each dimension. Determine the area of the test piece, correct to the nearest 0. 25 percent of the area. Weigh the test piece correct to 3 significant figures. Conduct the determination on all the test pieces.

Substance in g/m2 = 10000 m / ab

where

m =                mass in g of the test piece,

a   =               length in cm of the test piece, and

b   =               width in cm of the test piece.

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